<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="imageUpload"
      :on-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }"
    >
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      <div v-if="tips">{{ tips }}</div>
      <div v-else>
        请上传
        <template v-if="fileSize">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </div>

    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
    <!-- <image-preview v-show="dialogVisible"></image-preview> -->
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
// import ImagePreview from './ImagePreview';

export default {
  // components: { ImagePreview },
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 500,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
    // 自定义提示内容
    tips: {
      type: String,
      default: "",
    },
    // 是否返回所有的数据
    returnAllData: {
      type: Boolean,
      default: false,
    },
  },
  data() {
    // const baseUrl = process.env.VUE_APP_BASE_API
    const baseUrl = "http://192.168.15.100:8988";
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl,
      uploadImgUrl: baseUrl + "/common/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",");
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === "string") {
              if (item.indexOf(this.baseUrl) === -1) {
                item = { name: item, url: item };
              } else {
                item = { name: item, url: item };
              }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$modal.msgError(
          `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
        );
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传图片，请稍候...");
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
      this.$modal.closeLoading();
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      this.$modal.closeLoading();
      if (res.code === 200) {
        // this.uploadList.push({ name: res.fileName, url: res.fileName });
        if (this.returnAllData) {
          this.uploadList.push(res);
        } else {
          this.uploadList.push({ name: res.name, url: res.url });
        }
        this.uploadedSuccessfully();
      } else {
        this.$modal.msgError(res.msg);
        this.number--;
        this.$refs.imageUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除图片
    handleDelete(file) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        let data = this.listToString(this.fileList);
        if (this.returnAllData) {
          data = this.fileList;
        }
        this.$emit("input", data);
      }
    },
    // 上传失败
    handleUploadError() {
      this.$modal.closeLoading();
      this.number--;
      this.$modal.msgError("上传图片失败，请重试");
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        let data = this.listToString(this.fileList);
        this.$modal.closeLoading();

        if (this.returnAllData) {
          data = this.fileList;
        }
        this.$emit("input", data);
      }
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        if (list[i].url) {
          // console.log(list[i]);
          // strs += list[i].url.replace(this.baseUrl, '') + separator;
          strs += list[i].url + separator;
        }
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
::v-deep .el-upload-list--picture-card .el-upload-list__item-thumbnail {
  object-fit: contain;
}
::v-deep .el-dialog {
  margin-top: 0 !important;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: none;
  background: transparent;
  .el-dialog__header {
    position: absolute;
    top: 50px;
    right: 50px;
    .el-dialog__title {
      display: none;
    }
    padding: 0;
  }
  .el-dialog__body {
    height: fit-content;
    img {
      max-height: 90vh;
      max-width: 90vw;
    }
  }
  .el-dialog__headerbtn {
    font-size: 24px;
    background: #2323236c;
    border-radius: 50%;
    padding: 2px;
    top: 0;
    height: 40px;
    width: 40px;
    .el-dialog__close {
      color: #ffffffb8;
    }
  }
}
</style>
